1625066221 has 8 divisors (see below), whose sum is σ = 1692336384. Its totient is φ = 1558724160.

The previous prime is 1625066207. The next prime is 1625066237. The reversal of 1625066221 is 1226605261.

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 1625066221 - 2¹⁷ = 1624935149 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1625066251) 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, 228451 + ... + 235456.

It is an arithmetic number, because the mean of its divisors is an integer number (211542048).

Almost surely, 2^1625066221 is an apocalyptic number.

It is an amenable number.

1625066221 is a deficient number, since it is larger than the sum of its proper divisors (67270163).

1625066221 is a wasteful number, since it uses less digits than its factorization.

1625066221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464051.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 1625066221 is about 40312.1101035408. The cubic root of 1625066221 is about 1175.6833136675.

The spelling of 1625066221 in words is "one billion, six hundred twenty-five million, sixty-six thousand, two hundred twenty-one".