155777000440 has 16 divisors (see below), whose sum is σ = 350498251080. Its totient is φ = 62310800160.

The previous prime is 155777000429. The next prime is 155777000441. The reversal of 155777000440 is 44000777551.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 3894425011 = 155777000440 / (1 + 5 + 5 + 7 + 7 + 7 + 0 + 0 + 0 + 4 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 155777000393 and 155777000402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155777000441) 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, 1947212466 + ... + 1947212545.

Almost surely, 2^155777000440 is an apocalyptic number.

155777000440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155777000440 is an abundant number, since it is smaller than the sum of its proper divisors (194721250640).

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

155777000440 is a wasteful number, since it uses less digits than its factorization.

155777000440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3894425022 (or 3894425018 counting only the distinct ones).

The product of its (nonzero) digits is 137200, while the sum is 40.

Adding to 155777000440 its reverse (44000777551), we get a palindrome (199777777991).

The spelling of 155777000440 in words is "one hundred fifty-five billion, seven hundred seventy-seven million, four hundred forty", and thus it is an aban number.