661337687379 has 16 divisors (see below), whose sum is σ = 882603491840. Its totient is φ = 440482030560.

The previous prime is 661337687363. The next prime is 661337687393. The reversal of 661337687379 is 973786733166.

It is not a de Polignac number, because 661337687379 - 2⁴ = 661337687363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (661337680379) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15091302 + ... + 15135060.

It is an arithmetic number, because the mean of its divisors is an integer number (55162718240).

Almost surely, 2^661337687379 is an apocalyptic number.

661337687379 is a deficient number, since it is larger than the sum of its proper divisors (221265804461).

661337687379 is a wasteful number, since it uses less digits than its factorization.

661337687379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48330.

The product of its digits is 144027072, while the sum is 66.

The spelling of 661337687379 in words is "six hundred sixty-one billion, three hundred thirty-seven million, six hundred eighty-seven thousand, three hundred seventy-nine".