145885888581 has 4 divisors (see below), whose sum is σ = 194514518112. Its totient is φ = 97257259052.

The previous prime is 145885888573. The next prime is 145885888591. The reversal of 145885888581 is 185888588541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 145885888581 - 2³ = 145885888573 is a prime.

It is a super-2 number, since 2×145885888581² (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 (145885888541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24314314761 + ... + 24314314766.

It is an arithmetic number, because the mean of its divisors is an integer number (48628629528).

Almost surely, 2^145885888581 is an apocalyptic number.

It is an amenable number.

145885888581 is a deficient number, since it is larger than the sum of its proper divisors (48628629531).

145885888581 is an equidigital number, since it uses as much as digits as its factorization.

145885888581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48628629530.

The product of its digits is 131072000, while the sum is 69.

The spelling of 145885888581 in words is "one hundred forty-five billion, eight hundred eighty-five million, eight hundred eighty-eight thousand, five hundred eighty-one".