1621005763514 has 32 divisors (see below), whose sum is σ = 2522636479440. Its totient is φ = 781220912640.

The previous prime is 1621005763483. The next prime is 1621005763583. The reversal of 1621005763514 is 4153675001261.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 552918652225 + 1068087111289 = 743585^2 + 1033483^2 .

It is an unprimeable number.

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 in 15 ways as a sum of consecutive naturals, for example, 28897334 + ... + 28953374.

Almost surely, 2^{1621005763514} is an apocalyptic number.

1621005763514 is a deficient number, since it is larger than the sum of its proper divisors (901630715926).

1621005763514 is an frugal number, since it uses more digits than its factorization.

1621005763514 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56723 (or 56665 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 41.

The spelling of 1621005763514 in words is "one trillion, six hundred twenty-one billion, five million, seven hundred sixty-three thousand, five hundred fourteen".