661465215183 has 8 divisors (see below), whose sum is σ = 902464169728. Its totient is φ = 430721535384.

The previous prime is 661465215149. The next prime is 661465215239. The reversal of 661465215183 is 381512564166.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 661465215183 - 2¹³ = 661465206991 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661465210183) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2563818535 + ... + 2563818792.

It is an arithmetic number, because the mean of its divisors is an integer number (112808021216).

Almost surely, 2^661465215183 is an apocalyptic number.

661465215183 is a deficient number, since it is larger than the sum of its proper divisors (240998954545).

661465215183 is a wasteful number, since it uses less digits than its factorization.

661465215183 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5127637373.

The product of its digits is 1036800, while the sum is 48.

The spelling of 661465215183 in words is "six hundred sixty-one billion, four hundred sixty-five million, two hundred fifteen thousand, one hundred eighty-three".