2145400205355 has 64 divisors (see below), whose sum is σ = 4231297958400. Its totient is φ = 1022563589760.

The previous prime is 2145400205303. The next prime is 2145400205359. The reversal of 2145400205355 is 5535020045412.

2145400205355 is a `hidden beast` number, since 2 + 1 + 45 + 400 + 205 + 3 + 5 + 5 = 666.

It is not a de Polignac number, because 2145400205355 - 2¹⁶ = 2145400139819 is a prime.

It is a super-2 number, since 2×2145400205355² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (2145400205359) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12155724 + ... + 12330953.

It is an arithmetic number, because the mean of its divisors is an integer number (66114030600).

Almost surely, 2^{2145400205355} is an apocalyptic number.

2145400205355 is a deficient number, since it is larger than the sum of its proper divisors (2085897753045).

2145400205355 is a wasteful number, since it uses less digits than its factorization.

2145400205355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24486761 (or 24486755 counting only the distinct ones).

The product of its (nonzero) digits is 120000, while the sum is 36.

The spelling of 2145400205355 in words is "two trillion, one hundred forty-five billion, four hundred million, two hundred five thousand, three hundred fifty-five".