19736690677 has 4 divisors (see below), whose sum is σ = 21530935296. Its totient is φ = 17942446060.

The previous prime is 19736690657. The next prime is 19736690681. The reversal of 19736690677 is 77609663791.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77609663791 = 11 ⋅7055423981.

It is a de Polignac number, because none of the positive numbers 2^k-19736690677 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19736690657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 897122293 + ... + 897122314.

It is an arithmetic number, because the mean of its divisors is an integer number (5382733824).

Almost surely, 2^19736690677 is an apocalyptic number.

It is an amenable number.

19736690677 is a deficient number, since it is larger than the sum of its proper divisors (1794244619).

19736690677 is a wasteful number, since it uses less digits than its factorization.

19736690677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1794244618.

The product of its (nonzero) digits is 18003384, while the sum is 61.

The spelling of 19736690677 in words is "nineteen billion, seven hundred thirty-six million, six hundred ninety thousand, six hundred seventy-seven".