111125657661 has 12 divisors (see below), whose sum is σ = 152280307872. Its totient is φ = 72081505008.

The previous prime is 111125657651. The next prime is 111125657677. The reversal of 111125657661 is 166756521111.

It is not a de Polignac number, because 111125657661 - 2¹³ = 111125649469 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111125657611) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13524705 + ... + 13532918.

It is an arithmetic number, because the mean of its divisors is an integer number (12690025656).

Almost surely, 2^111125657661 is an apocalyptic number.

It is an amenable number.

111125657661 is a deficient number, since it is larger than the sum of its proper divisors (41154650211).

111125657661 is an equidigital number, since it uses as much as digits as its factorization.

111125657661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27057700 (or 27057663 counting only the distinct ones).

The product of its digits is 75600, while the sum is 42.

The spelling of 111125657661 in words is "one hundred eleven billion, one hundred twenty-five million, six hundred fifty-seven thousand, six hundred sixty-one".