661875037386 has 8 divisors (see below), whose sum is σ = 1323750074784. Its totient is φ = 220625012460.

The previous prime is 661875037361. The next prime is 661875037441. The reversal of 661875037386 is 683730578166.

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

661875037386 is an admirable number.

It is a super-2 number, since 2×661875037386² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

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, 55156253110 + ... + 55156253121.

It is an arithmetic number, because the mean of its divisors is an integer number (165468759348).

Almost surely, 2^661875037386 is an apocalyptic number.

661875037386 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

661875037386 is a wasteful number, since it uses less digits than its factorization.

661875037386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110312506236.

The product of its (nonzero) digits is 30481920, while the sum is 60.

The spelling of 661875037386 in words is "six hundred sixty-one billion, eight hundred seventy-five million, thirty-seven thousand, three hundred eighty-six".