1655901641 has 4 divisors (see below), whose sum is σ = 1657256832. Its totient is φ = 1654546452.

The previous prime is 1655901619. The next prime is 1655901671. The reversal of 1655901641 is 1461095561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1461095561 = 9781 ⋅149381.

It is a cyclic number.

It is not a de Polignac number, because 1655901641 - 2¹⁸ = 1655639497 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1655901595 and 1655901604.

It is not an unprimeable number, because it can be changed into a prime (1655901671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 675761 + ... + 678206.

It is an arithmetic number, because the mean of its divisors is an integer number (414314208).

Almost surely, 2^1655901641 is an apocalyptic number.

It is an amenable number.

1655901641 is a deficient number, since it is larger than the sum of its proper divisors (1355191).

1655901641 is a wasteful number, since it uses less digits than its factorization.

1655901641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1355190.

The product of its (nonzero) digits is 32400, while the sum is 38.

The square root of 1655901641 is about 40692.7713605254. The cubic root of 1655901641 is about 1183.0729159311.

The spelling of 1655901641 in words is "one billion, six hundred fifty-five million, nine hundred one thousand, six hundred forty-one".