61536463665 has 32 divisors (see below), whose sum is σ = 101657742336. Its totient is φ = 31753466880.

The previous prime is 61536463663. The next prime is 61536463687. The reversal of 61536463665 is 56636463516.

It is not a de Polignac number, because 61536463665 - 2¹ = 61536463663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61536463663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2439397 + ... + 2464493.

It is an arithmetic number, because the mean of its divisors is an integer number (3176804448).

Almost surely, 2^61536463665 is an apocalyptic number.

It is an amenable number.

61536463665 is a deficient number, since it is larger than the sum of its proper divisors (40121278671).

61536463665 is a wasteful number, since it uses less digits than its factorization.

61536463665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30409.

The product of its digits is 6998400, while the sum is 51.

The spelling of 61536463665 in words is "sixty-one billion, five hundred thirty-six million, four hundred sixty-three thousand, six hundred sixty-five".