155464535989 has 4 divisors (see below), whose sum is σ = 177673755424. Its totient is φ = 133255316556.

The previous prime is 155464535983. The next prime is 155464535999. The reversal of 155464535989 is 989535464551.

It is a happy number.

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 155464535989 - 2⁹ = 155464535477 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 155464535989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155464535983) 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, 11104609707 + ... + 11104609720.

It is an arithmetic number, because the mean of its divisors is an integer number (44418438856).

Almost surely, 2^155464535989 is an apocalyptic number.

It is an amenable number.

155464535989 is a deficient number, since it is larger than the sum of its proper divisors (22209219435).

155464535989 is an equidigital number, since it uses as much as digits as its factorization.

155464535989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22209219434.

The product of its digits is 116640000, while the sum is 64.

The spelling of 155464535989 in words is "one hundred fifty-five billion, four hundred sixty-four million, five hundred thirty-five thousand, nine hundred eighty-nine".