61591707299808 has 144 divisors (see below), whose sum is σ = 200804511529440. Its totient is φ = 17542117444608.

The previous prime is 61591707299783. The next prime is 61591707299827. The reversal of 61591707299808 is 80899270719516.

It is a happy number.

61591707299808 is a `hidden beast` number, since 6 + 1 + 591 + 7 + 0 + 7 + 29 + 9 + 8 + 0 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 47549323 + ... + 48827466.

It is an arithmetic number, because the mean of its divisors is an integer number (1394475774510).

Almost surely, 2^{61591707299808} is an apocalyptic number.

It is an amenable number.

61591707299808 is an abundant number, since it is smaller than the sum of its proper divisors (139212804229632).

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

61591707299808 is a wasteful number, since it uses less digits than its factorization.

61591707299808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96377129 (or 96377118 counting only the distinct ones).

The product of its (nonzero) digits is 137168640, while the sum is 72.

The spelling of 61591707299808 in words is "sixty-one trillion, five hundred ninety-one billion, seven hundred seven million, two hundred ninety-nine thousand, eight hundred eight".