1621005342375 has 32 divisors (see below), whose sum is σ = 2697816768192. Its totient is φ = 864387504000.

The previous prime is 1621005342371. The next prime is 1621005342379. The reversal of 1621005342375 is 5732435001261.

It is an interprime number because it is at equal distance from previous prime (1621005342371) and next prime (1621005342379).

It is not a de Polignac number, because 1621005342375 - 2² = 1621005342371 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621005342371) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1829109 + ... + 2566641.

It is an arithmetic number, because the mean of its divisors is an integer number (84306774006).

Almost surely, 2^{1621005342375} is an apocalyptic number.

1621005342375 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1621005342375 is a deficient number, since it is larger than the sum of its proper divisors (1076811425817).

1621005342375 is an equidigital number, since it uses as much as digits as its factorization.

1621005342375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 743412 (or 743402 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 39.

The spelling of 1621005342375 in words is "one trillion, six hundred twenty-one billion, five million, three hundred forty-two thousand, three hundred seventy-five".