661160051004 has 12 divisors (see below), whose sum is σ = 1542706785704. Its totient is φ = 220386683664.

The previous prime is 661160050997. The next prime is 661160051009. The reversal of 661160051004 is 400150061166.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×661160051004² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (661160051009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27548335447 + ... + 27548335470.

Almost surely, 2^661160051004 is an apocalyptic number.

It is an amenable number.

661160051004 is an abundant number, since it is smaller than the sum of its proper divisors (881546734700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

661160051004 is a wasteful number, since it uses less digits than its factorization.

661160051004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55096670924 (or 55096670922 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The spelling of 661160051004 in words is "six hundred sixty-one billion, one hundred sixty million, fifty-one thousand, four".