1621723375077 has 16 divisors (see below), whose sum is σ = 2328656400000. Its totient is φ = 997971630912.

The previous prime is 1621723375049. The next prime is 1621723375081. The reversal of 1621723375077 is 7705733271261.

It is not a de Polignac number, because 1621723375077 - 2¹⁶ = 1621723309541 is a prime.

It is a super-2 number, since 2×1621723375077² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621723375037) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3921799 + ... + 4315547.

It is an arithmetic number, because the mean of its divisors is an integer number (145541025000).

Almost surely, 2^{1621723375077} is an apocalyptic number.

It is an amenable number.

1621723375077 is a deficient number, since it is larger than the sum of its proper divisors (706933024923).

1621723375077 is a wasteful number, since it uses less digits than its factorization.

1621723375077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499372.

The product of its (nonzero) digits is 2593080, while the sum is 51.

The spelling of 1621723375077 in words is "one trillion, six hundred twenty-one billion, seven hundred twenty-three million, three hundred seventy-five thousand, seventy-seven".