128737091554 has 4 divisors (see below), whose sum is σ = 193105637334. Its totient is φ = 64368545776.

The previous prime is 128737091533. The next prime is 128737091557. The reversal of 128737091554 is 455190737821.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 109113284329 + 19623807225 = 330323^2 + 140085^2 .

It is not an unprimeable number, because it can be changed into a prime (128737091557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32184272887 + ... + 32184272890.

Almost surely, 2^128737091554 is an apocalyptic number.

128737091554 is a deficient number, since it is larger than the sum of its proper divisors (64368545780).

128737091554 is an equidigital number, since it uses as much as digits as its factorization.

128737091554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64368545779.

The product of its (nonzero) digits is 2116800, while the sum is 52.

The spelling of 128737091554 in words is "one hundred twenty-eight billion, seven hundred thirty-seven million, ninety-one thousand, five hundred fifty-four".