145715521491 has 12 divisors (see below), whose sum is σ = 210565742400. Its totient is φ = 97103173200.

The previous prime is 145715521489. The next prime is 145715521493. The reversal of 145715521491 is 194125517541.

145715521491 is a `hidden beast` number, since 1 + 4 + 5 + 7 + 1 + 552 + 1 + 4 + 91 = 666.

It is an interprime number because it is at equal distance from previous prime (145715521489) and next prime (145715521493).

It is not a de Polignac number, because 145715521491 - 2¹ = 145715521489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (145715521493) 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, 3352860 + ... + 3396041.

It is an arithmetic number, because the mean of its divisors is an integer number (17547145200).

Almost surely, 2^145715521491 is an apocalyptic number.

145715521491 is a deficient number, since it is larger than the sum of its proper divisors (64850220909).

145715521491 is a wasteful number, since it uses less digits than its factorization.

145715521491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6751306 (or 6751303 counting only the distinct ones).

The product of its digits is 252000, while the sum is 45.

The spelling of 145715521491 in words is "one hundred forty-five billion, seven hundred fifteen million, five hundred twenty-one thousand, four hundred ninety-one".