19695746364121 has 3 divisors (see below), whose sum is σ = 19695750802111. Its totient is φ = 19695741926132.

The previous prime is 19695746364109. The next prime is 19695746364149. The reversal of 19695746364121 is 12146364759691.

It is a happy number.

The square root of 19695746364121 is 4437989.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 329233816521 + 19366512547600 = 573789^2 + 4400740^2 .

It is a de Polignac number, because none of the positive numbers 2^k-19695746364121 is a prime.

It is a super-2 number, since 2×19695746364121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19695746364181) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2218995 + ... + 6656983.

Almost surely, 2^{19695746364121} is an apocalyptic number.

19695746364121 is the 4437989-th square number.

19695746364121 is the 2218995-th centered octagonal number.

It is an amenable number.

19695746364121 is a deficient number, since it is larger than the sum of its proper divisors (4437990).

19695746364121 is an frugal number, since it uses more digits than its factorization.

19695746364121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8875978 (or 4437989 counting only the distinct ones).

The product of its digits is 58786560, while the sum is 64.

The spelling of 19695746364121 in words is "nineteen trillion, six hundred ninety-five billion, seven hundred forty-six million, three hundred sixty-four thousand, one hundred twenty-one".