1606257706621 has 8 divisors (see below), whose sum is σ = 1617875330400. Its totient is φ = 1594640966160.

The previous prime is 1606257706609. The next prime is 1606257706631. The reversal of 1606257706621 is 1266077526061.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1606257706621 - 2⁵ = 1606257706589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1606257706601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3677010 + ... + 4090588.

It is an arithmetic number, because the mean of its divisors is an integer number (202234416300).

Almost surely, 2^{1606257706621} is an apocalyptic number.

It is an amenable number.

1606257706621 is a deficient number, since it is larger than the sum of its proper divisors (11617623779).

1606257706621 is a wasteful number, since it uses less digits than its factorization.

1606257706621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 441659.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The spelling of 1606257706621 in words is "one trillion, six hundred six billion, two hundred fifty-seven million, seven hundred six thousand, six hundred twenty-one".