213795781077 has 16 divisors (see below), whose sum is σ = 294929087040. Its totient is φ = 137597776512.

The previous prime is 213795781057. The next prime is 213795781091. The reversal of 213795781077 is 770187597312.

It is not a de Polignac number, because 213795781077 - 2¹⁶ = 213795715541 is a prime.

It is a super-2 number, since 2×213795781077² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213795781037) 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, 529953 + ... + 841689.

It is an arithmetic number, because the mean of its divisors is an integer number (18433067940).

Almost surely, 2^213795781077 is an apocalyptic number.

It is an amenable number.

213795781077 is a deficient number, since it is larger than the sum of its proper divisors (81133305963).

213795781077 is a wasteful number, since it uses less digits than its factorization.

213795781077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319652.

The product of its (nonzero) digits is 5186160, while the sum is 57.

The spelling of 213795781077 in words is "two hundred thirteen billion, seven hundred ninety-five million, seven hundred eighty-one thousand, seventy-seven".