145936993581 has 24 divisors (see below), whose sum is σ = 221931950240. Its totient is φ = 92154348000.

The previous prime is 145936993511. The next prime is 145936993597. The reversal of 145936993581 is 185399639541.

145936993581 is a `hidden beast` number, since 1 + 4 + 593 + 6 + 9 + 9 + 35 + 8 + 1 = 666.

It is not a de Polignac number, because 145936993581 - 2⁷ = 145936993453 is a prime.

It is a super-2 number, since 2×145936993581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145936993511) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 927591 + ... + 1073451.

Almost surely, 2^145936993581 is an apocalyptic number.

It is an amenable number.

145936993581 is a deficient number, since it is larger than the sum of its proper divisors (75994956659).

145936993581 is a wasteful number, since it uses less digits than its factorization.

145936993581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151737 (or 151734 counting only the distinct ones).

The product of its digits is 31492800, while the sum is 63.

The spelling of 145936993581 in words is "one hundred forty-five billion, nine hundred thirty-six million, nine hundred ninety-three thousand, five hundred eighty-one".