1630978855 has 32 divisors (see below), whose sum is σ = 2166248448. Its totient is φ = 1168972800.

The previous prime is 1630978837. The next prime is 1630978871. The reversal of 1630978855 is 5588790361.

It is not a de Polignac number, because 1630978855 - 2⁹ = 1630978343 is a prime.

It is a super-2 number, since 2×1630978855² = 5320184050914222050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1658694 + ... + 1659676.

It is an arithmetic number, because the mean of its divisors is an integer number (67695264).

Almost surely, 2^1630978855 is an apocalyptic number.

1630978855 is a deficient number, since it is larger than the sum of its proper divisors (535269593).

1630978855 is a wasteful number, since it uses less digits than its factorization.

1630978855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407.

The product of its (nonzero) digits is 1814400, while the sum is 52.

The square root of 1630978855 is about 40385.3792231793. The cubic root of 1630978855 is about 1177.1074549145.

The spelling of 1630978855 in words is "one billion, six hundred thirty million, nine hundred seventy-eight thousand, eight hundred fifty-five".