121557713601 has 8 divisors (see below), whose sum is σ = 162078854464. Its totient is φ = 81037524240.

The previous prime is 121557713579. The next prime is 121557713663. The reversal of 121557713601 is 106317755121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 121557713601 - 2¹⁵ = 121557680833 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121557713601.

It is not an unprimeable number, because it can be changed into a prime (121557714601) 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 7 ways as a sum of consecutive naturals, for example, 151071 + ... + 515691.

It is an arithmetic number, because the mean of its divisors is an integer number (20259856808).

Almost surely, 2^121557713601 is an apocalyptic number.

It is an amenable number.

121557713601 is a deficient number, since it is larger than the sum of its proper divisors (40521140863).

121557713601 is a wasteful number, since it uses less digits than its factorization.

121557713601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475751.

The product of its (nonzero) digits is 44100, while the sum is 39.

The spelling of 121557713601 in words is "one hundred twenty-one billion, five hundred fifty-seven million, seven hundred thirteen thousand, six hundred one".