1601640655 has 16 divisors (see below), whose sum is σ = 1959971904. Its totient is φ = 1256020480.

The previous prime is 1601640647. The next prime is 1601640661. The reversal of 1601640655 is 5560461061.

It is a happy number.

It is not a de Polignac number, because 1601640655 - 2³ = 1601640647 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1601640655.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 423975 + ... + 427735.

It is an arithmetic number, because the mean of its divisors is an integer number (122498244).

Almost surely, 2^1601640655 is an apocalyptic number.

1601640655 is a deficient number, since it is larger than the sum of its proper divisors (358331249).

1601640655 is a wasteful number, since it uses less digits than its factorization.

1601640655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5426.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 1601640655 is about 40020.5029328718. The cubic root of 1601640655 is about 1170.0067340787.

The spelling of 1601640655 in words is "one billion, six hundred one million, six hundred forty thousand, six hundred fifty-five".