38780400555 has 24 divisors (see below), whose sum is σ = 72390082128. Its totient is φ = 19091889216.

The previous prime is 38780400551. The next prime is 38780400559. The reversal of 38780400555 is 55500408783.

It is an interprime number because it is at equal distance from previous prime (38780400551) and next prime (38780400559).

It is not a de Polignac number, because 38780400555 - 2² = 38780400551 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 38780400555.

It is not an unprimeable number, because it can be changed into a prime (38780400551) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33145057 + ... + 33146226.

It is an arithmetic number, because the mean of its divisors is an integer number (3016253422).

Almost surely, 2^38780400555 is an apocalyptic number.

38780400555 is a deficient number, since it is larger than the sum of its proper divisors (33609681573).

38780400555 is a wasteful number, since it uses less digits than its factorization.

38780400555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66291307 (or 66291304 counting only the distinct ones).

The product of its (nonzero) digits is 672000, while the sum is 45.

The spelling of 38780400555 in words is "thirty-eight billion, seven hundred eighty million, four hundred thousand, five hundred fifty-five".