61699268643 has 4 divisors (see below), whose sum is σ = 82265691528. Its totient is φ = 41132845760.

The previous prime is 61699268627. The next prime is 61699268663. The reversal of 61699268643 is 34686299616.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61699268643 - 2⁴ = 61699268627 is a prime.

It is a super-2 number, since 2×61699268643² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (61699268663) 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, 10283211438 + ... + 10283211443.

It is an arithmetic number, because the mean of its divisors is an integer number (20566422882).

Almost surely, 2^61699268643 is an apocalyptic number.

61699268643 is a deficient number, since it is larger than the sum of its proper divisors (20566422885).

61699268643 is a wasteful number, since it uses less digits than its factorization.

61699268643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20566422884.

The product of its digits is 20155392, while the sum is 60.

The spelling of 61699268643 in words is "sixty-one billion, six hundred ninety-nine million, two hundred sixty-eight thousand, six hundred forty-three".