1641165573951 has 48 divisors (see below), whose sum is σ = 2442788187840. Its totient is φ = 1060983567360.

The previous prime is 1641165573941. The next prime is 1641165573979. The reversal of 1641165573951 is 1593755611461.

1641165573951 is a `hidden beast` number, since 1 + 6 + 4 + 1 + 1 + 6 + 557 + 39 + 51 = 666.

It is not a de Polignac number, because 1641165573951 - 2¹⁷ = 1641165442879 is a prime.

It is a super-2 number, since 2×1641165573951² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641165573941) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 141072631 + ... + 141084263.

It is an arithmetic number, because the mean of its divisors is an integer number (50891420580).

Almost surely, 2^{1641165573951} is an apocalyptic number.

1641165573951 is a deficient number, since it is larger than the sum of its proper divisors (801622613889).

1641165573951 is a wasteful number, since it uses less digits than its factorization.

1641165573951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13056 (or 13053 counting only the distinct ones).

The product of its digits is 3402000, while the sum is 54.

The spelling of 1641165573951 in words is "one trillion, six hundred forty-one billion, one hundred sixty-five million, five hundred seventy-three thousand, nine hundred fifty-one".