213506311256545 has 16 divisors (see below), whose sum is σ = 256487733099648. Its totient is φ = 170618322067200.

The previous prime is 213506311256533. The next prime is 213506311256551. The reversal of 213506311256545 is 545652113605312.

It is not a de Polignac number, because 213506311256545 - 2¹⁹ = 213506310732257 is a prime.

It is a super-3 number, since 3×213506311256545³ (a number of 44 digits) contains 333 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34205892 + ... + 39963178.

It is an arithmetic number, because the mean of its divisors is an integer number (16030483318728).

Almost surely, 2^{213506311256545} is an apocalyptic number.

It is an amenable number.

213506311256545 is a deficient number, since it is larger than the sum of its proper divisors (42981421843103).

213506311256545 is a wasteful number, since it uses less digits than its factorization.

213506311256545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5765400.

The product of its (nonzero) digits is 3240000, while the sum is 49.

The spelling of 213506311256545 in words is "two hundred thirteen trillion, five hundred six billion, three hundred eleven million, two hundred fifty-six thousand, five hundred forty-five".