1604955217551 has 16 divisors (see below), whose sum is σ = 2446816838400. Its totient is φ = 916678219968.

The previous prime is 1604955217519. The next prime is 1604955217571. The reversal of 1604955217551 is 1557125594061.

It is not a de Polignac number, because 1604955217551 - 2⁵ = 1604955217519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1604955217494 and 1604955217503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1604955217501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18248721 + ... + 18336458.

It is an arithmetic number, because the mean of its divisors is an integer number (152926052400).

Almost surely, 2^{1604955217551} is an apocalyptic number.

1604955217551 is a deficient number, since it is larger than the sum of its proper divisors (841861620849).

1604955217551 is a wasteful number, since it uses less digits than its factorization.

1604955217551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36587278.

The product of its (nonzero) digits is 1890000, while the sum is 51.

The spelling of 1604955217551 in words is "one trillion, six hundred four billion, nine hundred fifty-five million, two hundred seventeen thousand, five hundred fifty-one".