61377053661 has 96 divisors (see below), whose sum is σ = 112709705472. Its totient is φ = 31261178880.

The previous prime is 61377053653. The next prime is 61377053677. The reversal of 61377053661 is 16635077316.

It is not a de Polignac number, because 61377053661 - 2³ = 61377053653 is a prime.

It is a super-2 number, since 2×61377053661² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61377053641) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 8748391 + ... + 8755403.

It is an arithmetic number, because the mean of its divisors is an integer number (1174059432).

Almost surely, 2^61377053661 is an apocalyptic number.

It is an amenable number.

61377053661 is a deficient number, since it is larger than the sum of its proper divisors (51332651811).

61377053661 is a wasteful number, since it uses less digits than its factorization.

61377053661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7283 (or 7280 counting only the distinct ones).

The product of its (nonzero) digits is 476280, while the sum is 45.

The spelling of 61377053661 in words is "sixty-one billion, three hundred seventy-seven million, fifty-three thousand, six hundred sixty-one".