20451526661610 has 64 divisors (see below), whose sum is σ = 59495350296960. Its totient is φ = 4957945856640.

The previous prime is 20451526661561. The next prime is 20451526661611. The reversal of 20451526661610 is 1616662515402.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20451526661611) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3443014987 + ... + 3443020926.

It is an arithmetic number, because the mean of its divisors is an integer number (929614848390).

Almost surely, 2^{20451526661610} is an apocalyptic number.

20451526661610 is an abundant number, since it is smaller than the sum of its proper divisors (39043823635350).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20451526661610 is a wasteful number, since it uses less digits than its factorization.

20451526661610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6886035940 (or 6886035934 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 20451526661610 in words is "twenty trillion, four hundred fifty-one billion, five hundred twenty-six million, six hundred sixty-one thousand, six hundred ten".