213565511378 has 8 divisors (see below), whose sum is σ = 320762691468. Its totient is φ = 106644614224.

The previous prime is 213565511359. The next prime is 213565511407. The reversal of 213565511378 is 873115565312.

It can be written as a sum of positive squares in 2 ways, for example, as 155853617089 + 57711894289 = 394783^2 + 240233^2 .

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

It is a super-2 number, since 2×213565511378² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69068801 + ... + 69071892.

Almost surely, 2^213565511378 is an apocalyptic number.

213565511378 is a deficient number, since it is larger than the sum of its proper divisors (107197180090).

213565511378 is a wasteful number, since it uses less digits than its factorization.

213565511378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138141468.

The product of its digits is 756000, while the sum is 47.

The spelling of 213565511378 in words is "two hundred thirteen billion, five hundred sixty-five million, five hundred eleven thousand, three hundred seventy-eight".