1620666461247 has 8 divisors (see below), whose sum is σ = 2167792413744. Its totient is φ = 1076992408128.

The previous prime is 1620666461237. The next prime is 1620666461273. The reversal of 1620666461247 is 7421646660261.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1620666461247 - 2⁷ = 1620666461119 is a prime.

It is a super-2 number, since 2×1620666461247² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1620666461247.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620666461207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 862973748 + ... + 862975625.

It is an arithmetic number, because the mean of its divisors is an integer number (270974051718).

Almost surely, 2^{1620666461247} is an apocalyptic number.

1620666461247 is a deficient number, since it is larger than the sum of its proper divisors (547125952497).

1620666461247 is a wasteful number, since it uses less digits than its factorization.

1620666461247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725949689.

The product of its (nonzero) digits is 3483648, while the sum is 51.

The spelling of 1620666461247 in words is "one trillion, six hundred twenty billion, six hundred sixty-six million, four hundred sixty-one thousand, two hundred forty-seven".