97912121161578 has 32 divisors (see below), whose sum is σ = 196772939089920. Its totient is φ = 32479630950960.

The previous prime is 97912121161499. The next prime is 97912121161643. The reversal of 97912121161578 is 87516112121979.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45620358 + ... + 47718353.

It is an arithmetic number, because the mean of its divisors is an integer number (6149154346560).

Almost surely, 2^{97912121161578} is an apocalyptic number.

97912121161578 is an abundant number, since it is smaller than the sum of its proper divisors (98860817928342).

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

97912121161578 is a wasteful number, since it uses less digits than its factorization.

97912121161578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93339562.

The product of its digits is 3810240, while the sum is 60.

The spelling of 97912121161578 in words is "ninety-seven trillion, nine hundred twelve billion, one hundred twenty-one million, one hundred sixty-one thousand, five hundred seventy-eight".