61761902091 has 16 divisors (see below), whose sum is σ = 83504678400. Its totient is φ = 40598277408.

The previous prime is 61761902087. The next prime is 61761902101. The reversal of 61761902091 is 19020916716.

61761902091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 61761902091 - 2² = 61761902087 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61761902791) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1176 + ... + 351461.

It is an arithmetic number, because the mean of its divisors is an integer number (5219042400).

Almost surely, 2^61761902091 is an apocalyptic number.

61761902091 is a deficient number, since it is larger than the sum of its proper divisors (21742776309).

61761902091 is a wasteful number, since it uses less digits than its factorization.

61761902091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353458.

The product of its (nonzero) digits is 40824, while the sum is 42.

The spelling of 61761902091 in words is "sixty-one billion, seven hundred sixty-one million, nine hundred two thousand, ninety-one".