1020902178651 has 4 divisors (see below), whose sum is σ = 1361202904872. Its totient is φ = 680601452432.

The previous prime is 1020902178649. The next prime is 1020902178683. The reversal of 1020902178651 is 1568712090201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1020902178651 - 2¹ = 1020902178649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1020902178641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170150363106 + ... + 170150363111.

It is an arithmetic number, because the mean of its divisors is an integer number (340300726218).

Almost surely, 2^{1020902178651} is an apocalyptic number.

1020902178651 is a deficient number, since it is larger than the sum of its proper divisors (340300726221).

1020902178651 is an equidigital number, since it uses as much as digits as its factorization.

1020902178651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 340300726220.

The product of its (nonzero) digits is 60480, while the sum is 42.

The spelling of 1020902178651 in words is "one trillion, twenty billion, nine hundred two million, one hundred seventy-eight thousand, six hundred fifty-one".