155430779988 has 24 divisors (see below), whose sum is σ = 395641985760. Its totient is φ = 47100236320.

The previous prime is 155430779957. The next prime is 155430780019. The reversal of 155430779988 is 889977034551.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (155430779957) and next prime (155430780019).

It is a super-2 number, since 2×155430779988² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (66).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 588752823 + ... + 588753086.

It is an arithmetic number, because the mean of its divisors is an integer number (16485082740).

Almost surely, 2^155430779988 is an apocalyptic number.

It is an amenable number.

155430779988 is an abundant number, since it is smaller than the sum of its proper divisors (240211205772).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155430779988 is a wasteful number, since it uses less digits than its factorization.

155430779988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1177505927 (or 1177505925 counting only the distinct ones).

The product of its (nonzero) digits is 76204800, while the sum is 66.

The spelling of 155430779988 in words is "one hundred fifty-five billion, four hundred thirty million, seven hundred seventy-nine thousand, nine hundred eighty-eight".