1620730611654 has 128 divisors (see below), whose sum is σ = 4173348372480. Its totient is φ = 407225145600.

The previous prime is 1620730611649. The next prime is 1620730611707. The reversal of 1620730611654 is 4561160370261.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 37688337 + ... + 37731315.

It is an arithmetic number, because the mean of its divisors is an integer number (32604284160).

Almost surely, 2^{1620730611654} is an apocalyptic number.

1620730611654 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1620730611654, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2086674186240).

1620730611654 is an abundant number, since it is smaller than the sum of its proper divisors (2552617760826).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1620730611654 is a wasteful number, since it uses less digits than its factorization.

1620730611654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45666.

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 1620730611654 in words is "one trillion, six hundred twenty billion, seven hundred thirty million, six hundred eleven thousand, six hundred fifty-four".