61651669744 has 40 divisors (see below), whose sum is σ = 137277106560. Its totient is φ = 26274525888.

The previous prime is 61651669727. The next prime is 61651669747. The reversal of 61651669744 is 44796615616.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61651669747) 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, 1517554 + ... + 1557649.

It is an arithmetic number, because the mean of its divisors is an integer number (3431927664).

Almost surely, 2^61651669744 is an apocalyptic number.

It is an amenable number.

61651669744 is an abundant number, since it is smaller than the sum of its proper divisors (75625436816).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61651669744 is a wasteful number, since it uses less digits than its factorization.

61651669744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3075397 (or 3075391 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 55.

The spelling of 61651669744 in words is "sixty-one billion, six hundred fifty-one million, six hundred sixty-nine thousand, seven hundred forty-four".