145715521535 has 4 divisors (see below), whose sum is σ = 174858625848. Its totient is φ = 116572417224.

The previous prime is 145715521531. The next prime is 145715521541. The reversal of 145715521535 is 535125517541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 535125517541 = 67 ⋅7986948023.

It is a cyclic number.

It is not a de Polignac number, because 145715521535 - 2² = 145715521531 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145715521531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14571552149 + ... + 14571552158.

It is an arithmetic number, because the mean of its divisors is an integer number (43714656462).

Almost surely, 2^145715521535 is an apocalyptic number.

145715521535 is a deficient number, since it is larger than the sum of its proper divisors (29143104313).

145715521535 is an equidigital number, since it uses as much as digits as its factorization.

145715521535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29143104312.

The product of its digits is 525000, while the sum is 44.

The spelling of 145715521535 in words is "one hundred forty-five billion, seven hundred fifteen million, five hundred twenty-one thousand, five hundred thirty-five".