1620671672737 has 8 divisors (see below), whose sum is σ = 1792510041896. Its totient is φ = 1455572063232.

The previous prime is 1620671672731. The next prime is 1620671672801. The reversal of 1620671672737 is 7372761760261.

It can be written as a sum of positive squares in 4 ways, for example, as 18242284096 + 1602429388641 = 135064^2 + 1265871^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1620671672737 - 2¹⁹ = 1620671148449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620671672731) 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, 1684689408 + ... + 1684690369.

It is an arithmetic number, because the mean of its divisors is an integer number (224063755237).

Almost surely, 2^{1620671672737} is an apocalyptic number.

It is an amenable number.

1620671672737 is a deficient number, since it is larger than the sum of its proper divisors (171838369159).

1620671672737 is a wasteful number, since it uses less digits than its factorization.

1620671672737 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3369379827.

The product of its (nonzero) digits is 6223392, while the sum is 55.

The spelling of 1620671672737 in words is "one trillion, six hundred twenty billion, six hundred seventy-one million, six hundred seventy-two thousand, seven hundred thirty-seven".