621511671066 has 64 divisors (see below), whose sum is σ = 1482131298816. Its totient is φ = 171254635200.

The previous prime is 621511671061. The next prime is 621511671101. The reversal of 621511671066 is 660176115126.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (621511671061) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5348280 + ... + 5463251.

It is an arithmetic number, because the mean of its divisors is an integer number (23158301544).

Almost surely, 2^621511671066 is an apocalyptic number.

621511671066 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

621511671066 is an abundant number, since it is smaller than the sum of its proper divisors (860619627750).

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

621511671066 is a wasteful number, since it uses less digits than its factorization.

621511671066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10811627.

The product of its (nonzero) digits is 90720, while the sum is 42.

The spelling of 621511671066 in words is "six hundred twenty-one billion, five hundred eleven million, six hundred seventy-one thousand, sixty-six".