61091797995 has 32 divisors (see below), whose sum is σ = 108772107840. Its totient is φ = 32532952320.

The previous prime is 61091797979. The next prime is 61091798003. The reversal of 61091797995 is 59979719016.

61091797995 is a `hidden beast` number, since 610 + 9 + 1 + 7 + 9 + 7 + 9 + 9 + 5 = 666.

It is not a de Polignac number, because 61091797995 - 2⁴ = 61091797979 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 253074 + ... + 431543.

It is an arithmetic number, because the mean of its divisors is an integer number (3399128370).

Almost surely, 2^61091797995 is an apocalyptic number.

61091797995 is a deficient number, since it is larger than the sum of its proper divisors (47680309845).

61091797995 is a wasteful number, since it uses less digits than its factorization.

61091797995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 685292 (or 685286 counting only the distinct ones).

The product of its (nonzero) digits is 9644670, while the sum is 63.

The spelling of 61091797995 in words is "sixty-one billion, ninety-one million, seven hundred ninety-seven thousand, nine hundred ninety-five".