1620946480477 has 4 divisors (see below), whose sum is σ = 1629901986076. Its totient is φ = 1611990974880.

The previous prime is 1620946480427. The next prime is 1620946480481. The reversal of 1620946480477 is 7740846490261.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 587523783001 + 1033422697476 = 766501^2 + 1016574^2 .

It is a cyclic number.

It is not a de Polignac number, because 1620946480477 - 2²⁷ = 1620812262749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620946480427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4477752528 + ... + 4477752889.

It is an arithmetic number, because the mean of its divisors is an integer number (407475496519).

Almost surely, 2^{1620946480477} is an apocalyptic number.

It is an amenable number.

1620946480477 is a deficient number, since it is larger than the sum of its proper divisors (8955505599).

1620946480477 is an equidigital number, since it uses as much as digits as its factorization.

1620946480477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8955505598.

The product of its (nonzero) digits is 16257024, while the sum is 58.

The spelling of 1620946480477 in words is "one trillion, six hundred twenty billion, nine hundred forty-six million, four hundred eighty thousand, four hundred seventy-seven".