999762215401 has 2 divisors, whose sum is σ = 999762215402. Its totient is φ = 999762215400.

The previous prime is 999762215381. The next prime is 999762215423. The reversal of 999762215401 is 104512267999.

999762215401 = T₈₁₆₃₉₈ + T₈₁₆₃₉₉ + T₈₁₆₄₀₀.

It is a happy number.

999762215401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 993508569001 + 6253646400 = 996749^2 + 79080^2 .

It is a cyclic number.

It is not a de Polignac number, because 999762215401 - 2⁵ = 999762215369 is a prime.

It is not a weakly prime, because it can be changed into another prime (999762215471) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499881107700 + 499881107701.

It is an arithmetic number, because the mean of its divisors is an integer number (499881107701).

Almost surely, 2^999762215401 is an apocalyptic number.

999762215401 is the 816400-th centered triangular number.

It is an amenable number.

999762215401 is a deficient number, since it is larger than the sum of its proper divisors (1).

999762215401 is an equidigital number, since it uses as much as digits as its factorization.

999762215401 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2449440, while the sum is 55.

The spelling of 999762215401 in words is "nine hundred ninety-nine billion, seven hundred sixty-two million, two hundred fifteen thousand, four hundred one".