61719192457898 has 4 divisors (see below), whose sum is σ = 92578788686850. Its totient is φ = 30859596228948.

The previous prime is 61719192457883. The next prime is 61719192457919. The reversal of 61719192457898 is 89875429191716.

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

It can be written as a sum of positive squares in only one way, i.e., 39236355515449 + 22482836942449 = 6263893^2 + 4741607^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15429798114473 + ... + 15429798114476.

Almost surely, 2^{61719192457898} is an apocalyptic number.

61719192457898 is a deficient number, since it is larger than the sum of its proper divisors (30859596228952).

61719192457898 is a wasteful number, since it uses less digits than its factorization.

61719192457898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30859596228951.

The product of its digits is 548674560, while the sum is 77.

The spelling of 61719192457898 in words is "sixty-one trillion, seven hundred nineteen billion, one hundred ninety-two million, four hundred fifty-seven thousand, eight hundred ninety-eight".