621956570049 has 6 divisors (see below), whose sum is σ = 898381712306. Its totient is φ = 414637713360.

The previous prime is 621956570041. The next prime is 621956570089. The reversal of 621956570049 is 940075659126.

621956570049 is a `hidden beast` number, since 6 + 2 + 1 + 9 + 565 + 70 + 0 + 4 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 550611489024 + 71345081025 = 742032^2 + 267105^2 .

It is not a de Polignac number, because 621956570049 - 2³ = 621956570041 is a prime.

It is a super-3 number, since 3×621956570049³ (a number of 36 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 621956569977 and 621956570004.

It is not an unprimeable number, because it can be changed into a prime (621956570041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34553142772 + ... + 34553142789.

Almost surely, 2^621956570049 is an apocalyptic number.

It is an amenable number.

621956570049 is a deficient number, since it is larger than the sum of its proper divisors (276425142257).

621956570049 is a wasteful number, since it uses less digits than its factorization.

621956570049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69106285567 (or 69106285564 counting only the distinct ones).

The product of its (nonzero) digits is 4082400, while the sum is 54.

The spelling of 621956570049 in words is "six hundred twenty-one billion, nine hundred fifty-six million, five hundred seventy thousand, forty-nine".