121755746642 has 16 divisors (see below), whose sum is σ = 184916136600. Its totient is φ = 60120134400.

The previous prime is 121755746627. The next prime is 121755746659. The reversal of 121755746642 is 246647557121.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 108090370441 + 13665376201 = 328771^2 + 116899^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 696167 + ... + 853322.

Almost surely, 2^121755746642 is an apocalyptic number.

121755746642 is a deficient number, since it is larger than the sum of its proper divisors (63160389958).

121755746642 is a wasteful number, since it uses less digits than its factorization.

121755746642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1549981.

The product of its digits is 2822400, while the sum is 50.

The spelling of 121755746642 in words is "one hundred twenty-one billion, seven hundred fifty-five million, seven hundred forty-six thousand, six hundred forty-two".