4066621557951 has 16 divisors (see below), whose sum is σ = 5442721222400. Its totient is φ = 2700810874368.

The previous prime is 4066621557857. The next prime is 4066621558031. The reversal of 4066621557951 is 1597551266604.

It is not a de Polignac number, because 4066621557951 - 2³⁵ = 4032261819583 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4066621557891 and 4066621557900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4066621557151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 555615 + ... + 2905503.

It is an arithmetic number, because the mean of its divisors is an integer number (340170076400).

Almost surely, 2^{4066621557951} is an apocalyptic number.

4066621557951 is a deficient number, since it is larger than the sum of its proper divisors (1376099664449).

4066621557951 is a wasteful number, since it uses less digits than its factorization.

4066621557951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2352078.

The product of its (nonzero) digits is 13608000, while the sum is 57.

The spelling of 4066621557951 in words is "four trillion, sixty-six billion, six hundred twenty-one million, five hundred fifty-seven thousand, nine hundred fifty-one".