145520431551 has 16 divisors (see below), whose sum is σ = 235184536320. Its totient is φ = 88194200760.

The previous prime is 145520431519. The next prime is 145520431583. The reversal of 145520431551 is 155134025541.

145520431551 is a `hidden beast` number, since 1 + 4 + 55 + 20 + 4 + 31 + 551 = 666.

It is an interprime number because it is at equal distance from previous prime (145520431519) and next prime (145520431583).

It is not a de Polignac number, because 145520431551 - 2⁵ = 145520431519 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (145520431591) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 244983595 + ... + 244984188.

It is an arithmetic number, because the mean of its divisors is an integer number (14699033520).

Almost surely, 2^145520431551 is an apocalyptic number.

145520431551 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

145520431551 is a deficient number, since it is larger than the sum of its proper divisors (89664104769).

145520431551 is a wasteful number, since it uses less digits than its factorization.

145520431551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489967803 (or 489967797 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 36.

The spelling of 145520431551 in words is "one hundred forty-five billion, five hundred twenty million, four hundred thirty-one thousand, five hundred fifty-one".