61809465957 has 8 divisors (see below), whose sum is σ = 82503487776. Its totient is φ = 41160877392.

The previous prime is 61809465943. The next prime is 61809465973. The reversal of 61809465957 is 75956490816.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 61809465957 - 2⁷ = 61809465829 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61809465957.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61809465917) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11355138 + ... + 11360579.

It is an arithmetic number, because the mean of its divisors is an integer number (10312935972).

Almost surely, 2^61809465957 is an apocalyptic number.

It is an amenable number.

61809465957 is a deficient number, since it is larger than the sum of its proper divisors (20694021819).

61809465957 is a wasteful number, since it uses less digits than its factorization.

61809465957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22716627.

The product of its (nonzero) digits is 16329600, while the sum is 60.

The spelling of 61809465957 in words is "sixty-one billion, eight hundred nine million, four hundred sixty-five thousand, nine hundred fifty-seven".