1620739723574 has 4 divisors (see below), whose sum is σ = 2431109585364. Its totient is φ = 810369861786.

The previous prime is 1620739723573. The next prime is 1620739723579. The reversal of 1620739723574 is 4753279370261.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1620739723573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 405184930892 + ... + 405184930895.

It is an arithmetic number, because the mean of its divisors is an integer number (607777396341).

Almost surely, 2^{1620739723574} is an apocalyptic number.

1620739723574 is a deficient number, since it is larger than the sum of its proper divisors (810369861790).

1620739723574 is an equidigital number, since it uses as much as digits as its factorization.

1620739723574 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810369861789.

The product of its (nonzero) digits is 13335840, while the sum is 56.

The spelling of 1620739723574 in words is "one trillion, six hundred twenty billion, seven hundred thirty-nine million, seven hundred twenty-three thousand, five hundred seventy-four".