1620612747665 has 8 divisors (see below), whose sum is σ = 1944784764288. Its totient is φ = 1296457220080.

The previous prime is 1620612747661. The next prime is 1620612747671. The reversal of 1620612747665 is 5667472160261.

It is a happy number.

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

It is not a de Polignac number, because 1620612747665 - 2² = 1620612747661 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1620612747661) 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, 3904991 + ... + 4300020.

It is an arithmetic number, because the mean of its divisors is an integer number (243098095536).

Almost surely, 2^{1620612747665} is an apocalyptic number.

It is an amenable number.

1620612747665 is a deficient number, since it is larger than the sum of its proper divisors (324172016623).

1620612747665 is an equidigital number, since it uses as much as digits as its factorization.

1620612747665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8244519.

The product of its (nonzero) digits is 5080320, while the sum is 53.

The spelling of 1620612747665 in words is "one trillion, six hundred twenty billion, six hundred twelve million, seven hundred forty-seven thousand, six hundred sixty-five".