145860621971 has 4 divisors (see below), whose sum is σ = 148612709232. Its totient is φ = 143108534712.

The previous prime is 145860621937. The next prime is 145860621989. The reversal of 145860621971 is 179126068541.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 145860621971 - 2³⁴ = 128680752787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (145860623971) 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, 1376043551 + ... + 1376043656.

It is an arithmetic number, because the mean of its divisors is an integer number (37153177308).

Almost surely, 2^145860621971 is an apocalyptic number.

145860621971 is a deficient number, since it is larger than the sum of its proper divisors (2752087261).

145860621971 is an equidigital number, since it uses as much as digits as its factorization.

145860621971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2752087260.

The product of its (nonzero) digits is 725760, while the sum is 50.

The spelling of 145860621971 in words is "one hundred forty-five billion, eight hundred sixty million, six hundred twenty-one thousand, nine hundred seventy-one".