1621155651007 has 2 divisors, whose sum is σ = 1621155651008. Its totient is φ = 1621155651006.

The previous prime is 1621155650981. The next prime is 1621155651013. The reversal of 1621155651007 is 7001565511261.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1621155651007 - 2³⁹ = 1071399837119 is a prime.

It is a super-2 number, since 2×1621155651007² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1621155651047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 810577825503 + 810577825504.

It is an arithmetic number, because the mean of its divisors is an integer number (810577825504).

Almost surely, 2^{1621155651007} is an apocalyptic number.

1621155651007 is a deficient number, since it is larger than the sum of its proper divisors (1).

1621155651007 is an equidigital number, since it uses as much as digits as its factorization.

1621155651007 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 63000, while the sum is 40.

The spelling of 1621155651007 in words is "one trillion, six hundred twenty-one billion, one hundred fifty-five million, six hundred fifty-one thousand, seven".