1655214640 has 40 divisors (see below), whose sum is σ = 4050923760. Its totient is φ = 627238656.

The previous prime is 1655214607. The next prime is 1655214653. The reversal of 1655214640 is 464125561.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 1655214596 and 1655214605.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 542959 + ... + 545998.

It is an arithmetic number, because the mean of its divisors is an integer number (101273094).

Almost surely, 2^1655214640 is an apocalyptic number.

1655214640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1655214640 is an abundant number, since it is smaller than the sum of its proper divisors (2395709120).

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

1655214640 is a wasteful number, since it uses less digits than its factorization.

1655214640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1088989 (or 1088983 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

The square root of 1655214640 is about 40684.3291698413. The cubic root of 1655214640 is about 1182.9092820769.

The spelling of 1655214640 in words is "one billion, six hundred fifty-five million, two hundred fourteen thousand, six hundred forty".