21958946658 has 72 divisors (see below), whose sum is σ = 53983308288. Its totient is φ = 6439554000.

The previous prime is 21958946651. The next prime is 21958946693. The reversal of 21958946658 is 85664985912.

21958946658 is a `hidden beast` number, since 2 + 1 + 9 + 589 + 46 + 6 + 5 + 8 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21958946595 and 21958946604.

It is not an unprimeable number, because it can be changed into a prime (21958946651) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 95098 + ... + 230133.

Almost surely, 2^21958946658 is an apocalyptic number.

21958946658 is an abundant number, since it is smaller than the sum of its proper divisors (32024361630).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21958946658 is a wasteful number, since it uses less digits than its factorization.

21958946658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325292 (or 325278 counting only the distinct ones).

The product of its digits is 37324800, while the sum is 63.

The spelling of 21958946658 in words is "twenty-one billion, nine hundred fifty-eight million, nine hundred forty-six thousand, six hundred fifty-eight".