145957121975 has 72 divisors (see below), whose sum is σ = 223415521920. Its totient is φ = 94109695680.

The previous prime is 145957121971. The next prime is 145957121977. The reversal of 145957121975 is 579121759541.

It is not a de Polignac number, because 145957121975 - 2² = 145957121971 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 145957121975.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145957121971) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1618424 + ... + 1706226.

It is an arithmetic number, because the mean of its divisors is an integer number (3102993360).

Almost surely, 2^145957121975 is an apocalyptic number.

145957121975 is a deficient number, since it is larger than the sum of its proper divisors (77458399945).

145957121975 is a wasteful number, since it uses less digits than its factorization.

145957121975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87909 (or 87897 counting only the distinct ones).

The product of its digits is 3969000, while the sum is 56.

The spelling of 145957121975 in words is "one hundred forty-five billion, nine hundred fifty-seven million, one hundred twenty-one thousand, nine hundred seventy-five".