91623466255561 has 4 divisors (see below), whose sum is σ = 91625724310932. Its totient is φ = 91621208200192.

The previous prime is 91623466255537. The next prime is 91623466255577. The reversal of 91623466255561 is 16555266432619.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59402164998400 + 32221301257161 = 7707280^2 + 5676381^2 .

It is a cyclic number.

It is not a de Polignac number, because 91623466255561 - 2²¹ = 91623464158409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91623466255561.

It is not an unprimeable number, because it can be changed into a prime (91623466255361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1128966820 + ... + 1129047973.

It is an arithmetic number, because the mean of its divisors is an integer number (22906431077733).

Almost surely, 2^{91623466255561} is an apocalyptic number.

It is an amenable number.

91623466255561 is a deficient number, since it is larger than the sum of its proper divisors (2258055371).

91623466255561 is a wasteful number, since it uses less digits than its factorization.

91623466255561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2258055370.

The product of its digits is 69984000, while the sum is 61.

The spelling of 91623466255561 in words is "ninety-one trillion, six hundred twenty-three billion, four hundred sixty-six million, two hundred fifty-five thousand, five hundred sixty-one".