61813880751 has 8 divisors (see below), whose sum is σ = 94192580224. Its totient is φ = 35322217560.

The previous prime is 61813880731. The next prime is 61813880753. The reversal of 61813880751 is 15708831816.

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

It is not a de Polignac number, because 61813880751 - 2⁵ = 61813880719 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61813880751.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61813880753) 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, 1471759045 + ... + 1471759086.

It is an arithmetic number, because the mean of its divisors is an integer number (11774072528).

Almost surely, 2^61813880751 is an apocalyptic number.

61813880751 is a deficient number, since it is larger than the sum of its proper divisors (32378699473).

61813880751 is a wasteful number, since it uses less digits than its factorization.

61813880751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2943518141.

The product of its (nonzero) digits is 322560, while the sum is 48.

The spelling of 61813880751 in words is "sixty-one billion, eight hundred thirteen million, eight hundred eighty thousand, seven hundred fifty-one".