70212257661 has 32 divisors (see below), whose sum is σ = 115927060480. Its totient is φ = 36807804864.

The previous prime is 70212257659. The next prime is 70212257693. The reversal of 70212257661 is 16675221207.

It is not a de Polignac number, because 70212257661 - 2¹ = 70212257659 is a prime.

It is a super-2 number, since 2×70212257661² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (70212257261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 744421 + ... + 833418.

It is an arithmetic number, because the mean of its divisors is an integer number (3622720640).

Almost surely, 2^70212257661 is an apocalyptic number.

It is an amenable number.

70212257661 is a deficient number, since it is larger than the sum of its proper divisors (45714802819).

70212257661 is a wasteful number, since it uses less digits than its factorization.

70212257661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1578025.

The product of its (nonzero) digits is 70560, while the sum is 39.

Adding to 70212257661 its reverse (16675221207), we get a palindrome (86887478868).

The spelling of 70212257661 in words is "seventy billion, two hundred twelve million, two hundred fifty-seven thousand, six hundred sixty-one".