655015919081 has 4 divisors (see below), whose sum is σ = 656318138112. Its totient is φ = 653713700052.

The previous prime is 655015919071. The next prime is 655015919101. The reversal of 655015919081 is 180919510556.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 655015919081 - 2²² = 655011724777 is a prime.

It is a super-2 number, since 2×655015919081² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (655015919071) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 651108761 + ... + 651109766.

It is an arithmetic number, because the mean of its divisors is an integer number (164079534528).

Almost surely, 2^655015919081 is an apocalyptic number.

It is an amenable number.

655015919081 is a deficient number, since it is larger than the sum of its proper divisors (1302219031).

655015919081 is a wasteful number, since it uses less digits than its factorization.

655015919081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1302219030.

The product of its (nonzero) digits is 486000, while the sum is 50.

The spelling of 655015919081 in words is "six hundred fifty-five billion, fifteen million, nine hundred nineteen thousand, eighty-one".