121778411544 has 48 divisors (see below), whose sum is σ = 334739179320. Its totient is φ = 39986939520.

The previous prime is 121778411543. The next prime is 121778411549. The reversal of 121778411544 is 445114877121.

121778411544 is a `hidden beast` number, since 1 + 2 + 17 + 7 + 84 + 11 + 544 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 121778411544.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121778411543) 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, 12617317 + ... + 12626964.

Almost surely, 2^121778411544 is an apocalyptic number.

It is an amenable number.

121778411544 is an abundant number, since it is smaller than the sum of its proper divisors (212960767776).

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

121778411544 is a wasteful number, since it uses less digits than its factorization.

121778411544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25244360 (or 25244353 counting only the distinct ones).

The product of its digits is 250880, while the sum is 45.

The spelling of 121778411544 in words is "one hundred twenty-one billion, seven hundred seventy-eight million, four hundred eleven thousand, five hundred forty-four".