145317939623 has 4 divisors (see below), whose sum is σ = 145482887088. Its totient is φ = 145152992160.

The previous prime is 145317939589. The next prime is 145317939629. The reversal of 145317939623 is 326939713541.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 326939713541 = 7 ⋅46705673363.

It is a cyclic number.

It is not a de Polignac number, because 145317939623 - 2⁸ = 145317939367 is a prime.

It is a super-2 number, since 2×145317939623² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145317939629) 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, 82472411 + ... + 82474172.

It is an arithmetic number, because the mean of its divisors is an integer number (36370721772).

Almost surely, 2^145317939623 is an apocalyptic number.

145317939623 is a deficient number, since it is larger than the sum of its proper divisors (164947465).

145317939623 is an equidigital number, since it uses as much as digits as its factorization.

145317939623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164947464.

The product of its digits is 3674160, while the sum is 53.

The spelling of 145317939623 in words is "one hundred forty-five billion, three hundred seventeen million, nine hundred thirty-nine thousand, six hundred twenty-three".