20525401650545 has 16 divisors (see below), whose sum is σ = 28037860912512. Its totient is φ = 14278540277760.

The previous prime is 20525401650541. The next prime is 20525401650557. The reversal of 20525401650545 is 54505610452502.

It is not a de Polignac number, because 20525401650545 - 2² = 20525401650541 is a prime.

It is a super-2 number, since 2×20525401650545² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20525401650496 and 20525401650505.

It is not an unprimeable number, because it can be changed into a prime (20525401650541) 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, 8112805712 + ... + 8112808241.

It is an arithmetic number, because the mean of its divisors is an integer number (1752366307032).

Almost surely, 2^{20525401650545} is an apocalyptic number.

It is an amenable number.

20525401650545 is a deficient number, since it is larger than the sum of its proper divisors (7512459261967).

20525401650545 is a wasteful number, since it uses less digits than its factorization.

20525401650545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16225613992.

The product of its (nonzero) digits is 1200000, while the sum is 44.

The spelling of 20525401650545 in words is "twenty trillion, five hundred twenty-five billion, four hundred one million, six hundred fifty thousand, five hundred forty-five".