2145023455551 has 16 divisors (see below), whose sum is σ = 2873787878400. Its totient is φ = 1423138288320.

The previous prime is 2145023455499. The next prime is 2145023455571. The reversal of 2145023455551 is 1555543205412.

It is a happy number.

It is not a de Polignac number, because 2145023455551 - 2¹⁸ = 2145023193407 is a prime.

It is a super-2 number, since 2×2145023455551² (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 (2145023455571) 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, 9509491 + ... + 9732443.

It is an arithmetic number, because the mean of its divisors is an integer number (179611742400).

Almost surely, 2^{2145023455551} is an apocalyptic number.

2145023455551 is a deficient number, since it is larger than the sum of its proper divisors (728764422849).

2145023455551 is a wasteful number, since it uses less digits than its factorization.

2145023455551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238366.

The product of its (nonzero) digits is 600000, while the sum is 42.

The spelling of 2145023455551 in words is "two trillion, one hundred forty-five billion, twenty-three million, four hundred fifty-five thousand, five hundred fifty-one".