20072156477 has 2 divisors, whose sum is σ = 20072156478. Its totient is φ = 20072156476.

The previous prime is 20072156471. The next prime is 20072156527. The reversal of 20072156477 is 77465127002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16182638521 + 3889517956 = 127211^2 + 62366^2 .

It is a cyclic number.

It is not a de Polignac number, because 20072156477 - 2⁶ = 20072156413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20072156471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10036078238 + 10036078239.

It is an arithmetic number, because the mean of its divisors is an integer number (10036078239).

Almost surely, 2^20072156477 is an apocalyptic number.

It is an amenable number.

20072156477 is a deficient number, since it is larger than the sum of its proper divisors (1).

20072156477 is an equidigital number, since it uses as much as digits as its factorization.

20072156477 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 164640, while the sum is 41.

The spelling of 20072156477 in words is "twenty billion, seventy-two million, one hundred fifty-six thousand, four hundred seventy-seven".