121656158475 has 12 divisors (see below), whose sum is σ = 201138182136. Its totient is φ = 64883284480.

The previous prime is 121656158473. The next prime is 121656158483. The reversal of 121656158475 is 574851656121.

It is not a de Polignac number, because 121656158475 - 2¹ = 121656158473 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121656158473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 811040982 + ... + 811041131.

It is an arithmetic number, because the mean of its divisors is an integer number (16761515178).

Almost surely, 2^121656158475 is an apocalyptic number.

121656158475 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121656158475 is a deficient number, since it is larger than the sum of its proper divisors (79482023661).

121656158475 is a wasteful number, since it uses less digits than its factorization.

121656158475 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1622082126 (or 1622082121 counting only the distinct ones).

The product of its digits is 2016000, while the sum is 51.

The spelling of 121656158475 in words is "one hundred twenty-one billion, six hundred fifty-six million, one hundred fifty-eight thousand, four hundred seventy-five".