20351645145155 has 8 divisors (see below), whose sum is σ = 24488519065152. Its totient is φ = 16236952855488.

The previous prime is 20351645145119. The next prime is 20351645145157. The reversal of 20351645145155 is 55154154615302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20351645145155 is a prime.

It is a super-2 number, since 2×20351645145155² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20351645145157) 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, 5545405562 + ... + 5545409231.

It is an arithmetic number, because the mean of its divisors is an integer number (3061064883144).

Almost surely, 2^{20351645145155} is an apocalyptic number.

20351645145155 is a deficient number, since it is larger than the sum of its proper divisors (4136873919997).

20351645145155 is a wasteful number, since it uses less digits than its factorization.

20351645145155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11090815165.

The product of its (nonzero) digits is 1800000, while the sum is 47.

The spelling of 20351645145155 in words is "twenty trillion, three hundred fifty-one billion, six hundred forty-five million, one hundred forty-five thousand, one hundred fifty-five".