661125182198 has 8 divisors (see below), whose sum is σ = 1067971448208. Its totient is φ = 305134699464.

The previous prime is 661125182171. The next prime is 661125182227. The reversal of 661125182198 is 891281521166.

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

It is a super-2 number, since 2×661125182198² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12713945786 + ... + 12713945837.

It is an arithmetic number, because the mean of its divisors is an integer number (133496431026).

Almost surely, 2^661125182198 is an apocalyptic number.

661125182198 is a deficient number, since it is larger than the sum of its proper divisors (406846266010).

661125182198 is a wasteful number, since it uses less digits than its factorization.

661125182198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25427891638.

The product of its digits is 414720, while the sum is 50.

The spelling of 661125182198 in words is "six hundred sixty-one billion, one hundred twenty-five million, one hundred eighty-two thousand, one hundred ninety-eight".