1655400634 has 4 divisors (see below), whose sum is σ = 2483100954. Its totient is φ = 827700316.

The previous prime is 1655400587. The next prime is 1655400641. The reversal of 1655400634 is 4360045561.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 4360045561 = 31 ⋅140646631.

It can be written as a sum of positive squares in only one way, i.e., 1652178609 + 3222025 = 40647^2 + 1795^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1655400634.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 413850157 + ... + 413850160.

Almost surely, 2^1655400634 is an apocalyptic number.

1655400634 is a deficient number, since it is larger than the sum of its proper divisors (827700320).

1655400634 is an equidigital number, since it uses as much as digits as its factorization.

1655400634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 827700319.

The product of its (nonzero) digits is 43200, while the sum is 34.

The square root of 1655400634 is about 40686.6149243212. The cubic root of 1655400634 is about 1182.9535876679.

The spelling of 1655400634 in words is "one billion, six hundred fifty-five million, four hundred thousand, six hundred thirty-four".